1 /*
2 * Copyright 2002-2014 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.springframework.expression.spel.ast;
18
19 import org.springframework.expression.EvaluationException;
20 import org.springframework.expression.TypedValue;
21 import org.springframework.expression.spel.ExpressionState;
22
23 /**
24 * Represents assignment. An alternative to calling setValue() for an expression is to use
25 * an assign.
26 *
27 * <p>Example: 'someNumberProperty=42'
28 *
29 * @author Andy Clement
30 * @since 3.0
31 */
32 public class Assign extends SpelNodeImpl {
33
34 public Assign(int pos,SpelNodeImpl... operands) {
35 super(pos,operands);
36 }
37
38
39 @Override
40 public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
41 TypedValue newValue = this.children[1].getValueInternal(state);
42 getChild(0).setValue(state, newValue.getValue());
43 return newValue;
44 }
45
46 @Override
47 public String toStringAST() {
48 return getChild(0).toStringAST() + "=" + getChild(1).toStringAST();
49 }
50
51 }